Nut-lock.



P. RIPPINGILLB & H. T. MARTIN.

' S NUT LOCK.

APPLICATION FILED 11111114, 1910.

1,000,196. Patented Aug. 8,1911.

'oNrTnn sTaTns PATENT orFTcE.

FRANK RIPPINGILLE, OF SUTTON COLDFIELD, AND HOVTARD THOMAS MARTIN, OF

BIRMINGHAM, ENGLAND.

NUT-LOCK.

To all whom it may concern:

Be it known that we, F RANK RIPPINGILLE and How-inn THOMAS MARTIN,subjects of the King of Great Britain, residing at The Cottage, FourOaks, Sutton Coldfield, England, and Granville street, Birmingham,England, respectively, have invented certain new and useful Improvementsin Nut-Locks, of which the following is a specification.

This invention relates to nut-locks employed for preventing nutsinadvertently working loose by vibration and the like.

The principal object of the present invention is to provide an improvedform of lock which is simple in construction but efficient in operation,and to provide means whereby the applying of the spanner to the nut inany direction will automatically release the locking element and freethe said nut, allowing it to be removed in the ordinary manner withoutfear of injury either to the threads or to the nut itself.

Figure l of the accompanying drawings represents a horizontal sectionthrough a hexagonal nut provided with a locking device constructed andarranged in accordance with this invention. This view shows the pawl inengagement with the threads of the bolt. Fig. 2 shows the nut engaged bythe spanner and the pawl released from engagement with the bolt. Fig. 3is a vertical section in the plane of the centrally located broken linesof Fig. 1. Fig. 4 is a vertical cross-section through the nut detachedfrom the bolt, the latter being shown in elevation.

The same letters of reference indicate corresponding parts in each ofthe figures of the drawings.

The locking device consists of a pawl 1 pivoted at 2 within a recess 3in the nut 4, and having a ratchet-toothed gripping edge 5 engaging withthe threads of the bolt 6. The said edge 5 is of a cam or eccentricformation, having its curved edge struck from a center located upon oneside of the pivot, and the pawl is so mounted that the point of contactwith the bolt comes behind (with ref erence to the direction of rotationof the nut) the radial line drawn from its fulcrum to the center of thebolt, so that while the nut is being screwed on, the toothed edge 5 ofthe pawl simply wipes over the threads and allows of the free rotationof the nut, but as soon as the latter tends to back-off or loosen thenthe frictional contact causes Specification of Letters Patent.

Application filed June 4, 1910.

Patented Aug. 8, 1911.

Serial No. 565,114.

the pawl 1 to turn on its fulcrum in such a manner that the toothed edge5 engages with or impinges against the threads of the bolt 6 andautomatically sets up a jamming or wedging action with the threads andlocks the nut. The pawl 1 is provided with a long tail or rearwardextension 7, of a curved form as shown, whose outer edge normallyextends, at 8, 9, and 10, slightly beyond the three adjacent sides orfacets of the nut, the said tail being located within a recess 11 in theside of the nut. Springs 12, 13, (or a single spring) act upon the tailin order to keep the edge 5 of the pawl in engagement with the threadsof the bolt. On applying a spanner 14 (see Fig. 2) to the nut in anydirection whatever, so as to embrace any two facets, one of its two jawswill engage with one of the projecting parts 8, 9, or 10, of the pawltail 7 and force the latter inward, compressing the spring or springsand taking the toothed edge 5 of the pawl out of engagement with thethreads of the bolt, thus releasing the nut and allowing of it beingremoved in the ordinary manner. In the case of a four-sided nut the tailof the pawl need only extend beyond two faces, while in an eight or moresided nut it would extend beyond four or more sides as may be required.

Instead of the releasing member being in one piece with the lockingdevice, it may be separate therefrom but adapted to engage with andrelease same on the application of the spanner.

Having fully described our invention, what we desire to claim and secureby Letters Patent is 1. In a nut lock, a nut having a recess whichextends to its bore, a pawl pivoted in the recess, the pawl having atoothed camfaced engaging portion eccentric to its pivot and of suchoutline that its point of engage ment with the bolt is at the rear of aradial line drawn from its pivot to the center of causing the engagementof the locking device and the bolt and a part associated with thelocking device and concentric to the bolt, the part having such extentas to project beyond half of the edge faces of the nut and beingoperable, when pressed inwardly, to cause the disengagement of thelocking device and the bolt.

3. In a nut lock, a polygonal nut having a recess which extends to itsbore, a pawl pivoted in the recess, the pawl having a toothed boltengaging portion adjacent its pivot and having also a curved tailnormally concentric to the bolt and of such extent as to project beyondhalf of the edge faces of the nut, the tail being rigidly associatedwith the pawl and, when pressed inwardly, causing the disengagement ofthe toothed engaging portion and the bolt, and springs which normallyforce the tail outwardly and 20 cause the engagement of said engagingportion and the bolt.

In testimony whereof we have hereunto set our hands in presence of twosubscribing witnesses.

FRANK RIPPINGILLE.

HOWVARD THOMAS MARTIN. \Vitnesses:

HY. SKERRETT,

HENRY NORTON SKERRETT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, D. C.

